Case:1:1 high quality 316F stainless steel, screw-in back and crown, deep and accurate engraved rehaut, random serial number engraved at 6:00 of the rehaut, different random serials on different cases. Functional escape valve.

Crystal:Super Thick Scratch-proof sapphire crystal with semi-invisible crown etched at 6:00 position of the crystal (same as genuine and this is the first of its kind, one revolutionary breakthrough of the Rolex replicas)